summaryrefslogtreecommitdiffstats
path: root/src/pybind/mgr/dashboard/rest_client.py
diff options
context:
space:
mode:
Diffstat (limited to 'src/pybind/mgr/dashboard/rest_client.py')
-rw-r--r--src/pybind/mgr/dashboard/rest_client.py531
1 files changed, 531 insertions, 0 deletions
diff --git a/src/pybind/mgr/dashboard/rest_client.py b/src/pybind/mgr/dashboard/rest_client.py
new file mode 100644
index 00000000..b287086f
--- /dev/null
+++ b/src/pybind/mgr/dashboard/rest_client.py
@@ -0,0 +1,531 @@
+# -*- coding: utf-8 -*-
+"""
+ * Copyright (c) 2017 SUSE LLC
+ *
+ * openATTIC is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2.
+ *
+ * This package is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+"""
+from __future__ import absolute_import
+
+from .settings import Settings
+from .tools import build_url
+import inspect
+import re
+import requests
+from requests.exceptions import ConnectionError, InvalidURL, Timeout
+from . import logger
+
+try:
+ from requests.packages.urllib3.exceptions import SSLError
+except ImportError:
+ from urllib3.exceptions import SSLError
+
+
+class TimeoutRequestsSession(requests.Session):
+ """
+ Set timeout argument for all requests if this is not already done.
+ """
+ def request(self, *args, **kwargs):
+ if ((args[8] if len(args) > 8 else None) is None) \
+ and kwargs.get('timeout') is None:
+ if Settings.REST_REQUESTS_TIMEOUT > 0:
+ kwargs['timeout'] = Settings.REST_REQUESTS_TIMEOUT
+ return super(TimeoutRequestsSession, self).request(*args, **kwargs)
+
+
+class RequestException(Exception):
+ def __init__(self,
+ message,
+ status_code=None,
+ content=None,
+ conn_errno=None,
+ conn_strerror=None):
+ super(RequestException, self).__init__(message)
+ self.status_code = status_code
+ self.content = content
+ self.conn_errno = conn_errno
+ self.conn_strerror = conn_strerror
+
+
+class BadResponseFormatException(RequestException):
+ def __init__(self, message):
+ super(BadResponseFormatException, self).__init__(
+ "Bad response format" if message is None else message, None)
+
+
+class _ResponseValidator(object):
+ """Simple JSON schema validator
+
+ This class implements a very simple validator for the JSON formatted
+ messages received by request responses from a RestClient instance.
+
+ The validator validates the JSON response against a "structure" string that
+ specifies the structure that the JSON response must comply. The validation
+ procedure raises a BadResponseFormatException in case of a validation
+ failure.
+
+ The structure syntax is given by the following grammar:
+
+ Structure ::= Level
+ Level ::= Path | Path '&' Level
+ Path ::= Step | Step '>'+ Path
+ Step ::= Key | '?' Key | '*' | '(' Level ')'
+ Key ::= <string> | Array+
+ Array ::= '[' <int> ']' | '[' '*' ']' | '[' '+' ']'
+
+ The symbols enclosed in ' ' are tokens of the language, and the + symbol
+ denotes repetition of of the preceding token at least once.
+
+ Examples of usage:
+
+ Example 1:
+ Validator args:
+ structure = "return > *"
+ response = { 'return': { ... } }
+
+ In the above example the structure will validate against any response
+ that contains a key named "return" in the root of the response
+ dictionary and its value is also a dictionary.
+
+ Example 2:
+ Validator args:
+ structure = "[*]"
+ response = [...]
+
+ In the above example the structure will validate against any response
+ that is an array of any size.
+
+ Example 3:
+ Validator args:
+ structure = "return[*]"
+ response = { 'return': [....] }
+
+ In the above example the structure will validate against any response
+ that contains a key named "return" in the root of the response
+ dictionary and its value is an array.
+
+ Example 4:
+ Validator args:
+ structure = "return[0] > token"
+ response = { 'return': [ { 'token': .... } ] }
+
+ In the above example the structure will validate against any response
+ that contains a key named "return" in the root of the response
+ dictionary and its value is an array, and the first element of the
+ array is a dictionary that contains the key 'token'.
+
+ Example 5:
+ Validator args:
+ structure = "return[0][*] > key1"
+ response = { 'return': [ [ { 'key1': ... } ], ...] }
+
+ In the above example the structure will validate against any response
+ that contains a key named "return" in the root of the response
+ dictionary where its value is an array, and the first value of this
+ array is also an array where all it's values must be a dictionary
+ containing a key named "key1".
+
+ Example 6:
+ Validator args:
+ structure = "return > (key1[*] & key2 & ?key3 > subkey)"
+ response = { 'return': { 'key1': [...], 'key2: .... } ] }
+
+ In the above example the structure will validate against any response
+ that contains a key named "return" in the root of the response
+ dictionary and its value is a dictionary that must contain a key named
+ "key1" that is an array, a key named "key2", and optionally a key named
+ "key3" that is a dictionary that contains a key named "subkey".
+
+ Example 7:
+ Validator args:
+ structure = "return >> roles[*]"
+ response = { 'return': { 'key1': { 'roles': [...] }, 'key2': { 'roles': [...] } } }
+
+ In the above example the structure will validate against any response
+ that contains a key named "return" in the root of the response
+ dictionary, and its value is a dictionary that for any key present in
+ the dictionary their value is also a dictionary that must contain a key
+ named 'roles' that is an array. Please note that you can use any
+ number of successive '>' to denote the level in the JSON tree that you
+ want to match next step in the path.
+
+ """
+
+ @staticmethod
+ def validate(structure, response):
+ if structure is None:
+ return
+
+ _ResponseValidator._validate_level(structure, response)
+
+ @staticmethod
+ def _validate_level(level, resp):
+ if not isinstance(resp, dict) and not isinstance(resp, list):
+ raise BadResponseFormatException(
+ "{} is neither a dict nor a list".format(resp))
+
+ paths = _ResponseValidator._parse_level_paths(level)
+ for path in paths:
+ path_sep = path.find('>')
+ if path_sep != -1:
+ level_next = path[path_sep + 1:].strip()
+ else:
+ path_sep = len(path)
+ level_next = None
+ key = path[:path_sep].strip()
+
+ if key == '*':
+ continue
+ elif key == '': # check all keys
+ for k in resp.keys():
+ _ResponseValidator._validate_key(k, level_next, resp)
+ else:
+ _ResponseValidator._validate_key(key, level_next, resp)
+
+ @staticmethod
+ def _validate_array(array_seq, level_next, resp):
+ if array_seq:
+ if not isinstance(resp, list):
+ raise BadResponseFormatException(
+ "{} is not an array".format(resp))
+ if array_seq[0].isdigit():
+ idx = int(array_seq[0])
+ if len(resp) <= idx:
+ raise BadResponseFormatException(
+ "length of array {} is lower than the index {}".format(
+ resp, idx))
+ _ResponseValidator._validate_array(array_seq[1:], level_next,
+ resp[idx])
+ elif array_seq[0] == '*':
+ for r in resp:
+ _ResponseValidator._validate_array(array_seq[1:],
+ level_next, r)
+ elif array_seq[0] == '+':
+ if len(resp) < 1:
+ raise BadResponseFormatException(
+ "array should not be empty")
+ for r in resp:
+ _ResponseValidator._validate_array(array_seq[1:],
+ level_next, r)
+ else:
+ raise Exception(
+ "Response structure is invalid: only <int> | '*' are "
+ "allowed as array index arguments")
+ else:
+ if level_next:
+ _ResponseValidator._validate_level(level_next, resp)
+
+ @staticmethod
+ def _validate_key(key, level_next, resp):
+ array_access = [a.strip() for a in key.split("[")]
+ key = array_access[0]
+ if key:
+ optional = key[0] == '?'
+ if optional:
+ key = key[1:]
+ if key not in resp:
+ if optional:
+ return
+ raise BadResponseFormatException(
+ "key {} is not in dict {}".format(key, resp))
+ resp_next = resp[key]
+ else:
+ resp_next = resp
+ if len(array_access) > 1:
+ _ResponseValidator._validate_array(
+ [a[0:-1] for a in array_access[1:]], level_next, resp_next)
+ else:
+ if level_next:
+ _ResponseValidator._validate_level(level_next, resp_next)
+
+ @staticmethod
+ def _parse_level_paths(level):
+ level = level.strip()
+ if level[0] == '(':
+ level = level[1:]
+ if level[-1] == ')':
+ level = level[:-1]
+
+ paths = []
+ lp = 0
+ nested = 0
+ for i, c in enumerate(level):
+ if c == '&' and nested == 0:
+ paths.append(level[lp:i].strip())
+ lp = i + 1
+ elif c == '(':
+ nested += 1
+ elif c == ')':
+ nested -= 1
+ paths.append(level[lp:].strip())
+ return paths
+
+
+class _Request(object):
+ def __init__(self, method, path, path_params, rest_client, resp_structure):
+ self.method = method
+ self.path = path
+ self.path_params = path_params
+ self.rest_client = rest_client
+ self.resp_structure = resp_structure
+
+ def _gen_path(self):
+ new_path = self.path
+ matches = re.finditer(r'\{(\w+?)\}', self.path)
+ for match in matches:
+ if match:
+ param_key = match.group(1)
+ if param_key in self.path_params:
+ new_path = new_path.replace(
+ match.group(0), self.path_params[param_key])
+ else:
+ raise RequestException(
+ 'Invalid path. Param "{}" was not specified'
+ .format(param_key), None)
+ return new_path
+
+ def __call__(self,
+ req_data=None,
+ method=None,
+ params=None,
+ data=None,
+ raw_content=False):
+ method = method if method else self.method
+ if not method:
+ raise Exception('No HTTP request method specified')
+ if req_data:
+ if method == 'get':
+ if params:
+ raise Exception('Ambiguous source of GET params')
+ params = req_data
+ else:
+ if data:
+ raise Exception('Ambiguous source of {} data'.format(
+ method.upper()))
+ data = req_data
+ resp = self.rest_client.do_request(method, self._gen_path(), params,
+ data, raw_content)
+ if raw_content and self.resp_structure:
+ raise Exception("Cannot validate response in raw format")
+ _ResponseValidator.validate(self.resp_structure, resp)
+ return resp
+
+
+class RestClient(object):
+ def __init__(self, host, port, client_name=None, ssl=False, auth=None, ssl_verify=True):
+ super(RestClient, self).__init__()
+ self.client_name = client_name if client_name else ''
+ self.host = host
+ self.port = port
+ self.base_url = build_url(
+ scheme='https' if ssl else 'http', host=host, port=port)
+ logger.debug("REST service base URL: %s", self.base_url)
+ self.headers = {'Accept': 'application/json'}
+ self.auth = auth
+ self.session = TimeoutRequestsSession()
+ self.session.verify = ssl_verify
+
+ def _login(self, request=None):
+ pass
+
+ def _is_logged_in(self):
+ pass
+
+ def _reset_login(self):
+ pass
+
+ def is_service_online(self, request=None):
+ pass
+
+ @staticmethod
+ def requires_login(func):
+ def func_wrapper(self, *args, **kwargs):
+ retries = 2
+ while True:
+ try:
+ if not self._is_logged_in():
+ self._login()
+ resp = func(self, *args, **kwargs)
+ return resp
+ except RequestException as e:
+ if isinstance(e, BadResponseFormatException):
+ raise e
+ retries -= 1
+ if e.status_code not in [401, 403] or retries == 0:
+ raise e
+ self._reset_login()
+
+ return func_wrapper
+
+ def do_request(self,
+ method,
+ path,
+ params=None,
+ data=None,
+ raw_content=False):
+ url = '{}{}'.format(self.base_url, path)
+ logger.debug('%s REST API %s req: %s data: %s', self.client_name,
+ method.upper(), path, data)
+ try:
+ if method.lower() == 'get':
+ resp = self.session.get(
+ url, headers=self.headers, params=params, auth=self.auth)
+ elif method.lower() == 'post':
+ resp = self.session.post(
+ url,
+ headers=self.headers,
+ params=params,
+ data=data,
+ auth=self.auth)
+ elif method.lower() == 'put':
+ resp = self.session.put(
+ url,
+ headers=self.headers,
+ params=params,
+ data=data,
+ auth=self.auth)
+ elif method.lower() == 'delete':
+ resp = self.session.delete(
+ url,
+ headers=self.headers,
+ params=params,
+ data=data,
+ auth=self.auth)
+ else:
+ raise RequestException('Method "{}" not supported'.format(
+ method.upper()), None)
+ if resp.ok:
+ logger.debug("%s REST API %s res status: %s content: %s",
+ self.client_name, method.upper(),
+ resp.status_code, resp.text)
+ if raw_content:
+ return resp.content
+ try:
+ return resp.json() if resp.text else None
+ except ValueError:
+ logger.error(
+ "%s REST API failed %s req while decoding JSON "
+ "response : %s",
+ self.client_name, method.upper(), resp.text)
+ raise RequestException(
+ "{} REST API failed request while decoding JSON "
+ "response: {}".format(self.client_name, resp.text),
+ resp.status_code, resp.text)
+ else:
+ logger.error(
+ "%s REST API failed %s req status: %s", self.client_name,
+ method.upper(), resp.status_code)
+ from pprint import pprint as pp
+ from pprint import pformat as pf
+
+ raise RequestException(
+ "{} REST API failed request with status code {}\n"
+ "{}" # TODO remove
+ .format(self.client_name, resp.status_code, pf(
+ resp.content)),
+ resp.status_code,
+ resp.content)
+ except ConnectionError as ex:
+ if ex.args:
+ if isinstance(ex.args[0], SSLError):
+ errno = "n/a"
+ strerror = "SSL error. Probably trying to access a non " \
+ "SSL connection."
+ logger.error("%s REST API failed %s, SSL error.",
+ self.client_name, method.upper())
+ else:
+ try:
+ match = re.match(r'.*: \[Errno (-?\d+)\] (.+)',
+ ex.args[0].reason.args[0])
+ except AttributeError:
+ match = False
+ if match:
+ errno = match.group(1)
+ strerror = match.group(2)
+ logger.error(
+ "%s REST API failed %s, connection error: "
+ "[errno: %s] %s",
+ self.client_name, method.upper(), errno, strerror)
+ else:
+ errno = "n/a"
+ strerror = "n/a"
+ logger.error(
+ "%s REST API failed %s, connection error.",
+ self.client_name, method.upper())
+ else:
+ errno = "n/a"
+ strerror = "n/a"
+ logger.error("%s REST API failed %s, connection error.",
+ self.client_name, method.upper())
+
+ if errno != "n/a":
+ ex_msg = (
+ "{} REST API cannot be reached: {} [errno {}]. "
+ "Please check your configuration and that the API endpoint"
+ " is accessible"
+ .format(self.client_name, strerror, errno))
+ else:
+ ex_msg = (
+ "{} REST API cannot be reached. Please check "
+ "your configuration and that the API endpoint is"
+ " accessible"
+ .format(self.client_name))
+ raise RequestException(
+ ex_msg, conn_errno=errno, conn_strerror=strerror)
+ except InvalidURL as ex:
+ logger.exception("%s REST API failed %s: %s", self.client_name,
+ method.upper(), str(ex))
+ raise RequestException(str(ex))
+ except Timeout as ex:
+ msg = "{} REST API {} timed out after {} seconds (url={}).".format(
+ self.client_name, ex.request.method, Settings.REST_REQUESTS_TIMEOUT,
+ ex.request.url)
+ logger.exception(msg)
+ raise RequestException(msg)
+
+ @staticmethod
+ def api(path, **api_kwargs):
+ def call_decorator(func):
+ def func_wrapper(self, *args, **kwargs):
+ method = api_kwargs.get('method', None)
+ resp_structure = api_kwargs.get('resp_structure', None)
+ args_name = inspect.getargspec(func).args
+ args_dict = dict(zip(args_name[1:], args))
+ for key, val in kwargs:
+ args_dict[key] = val
+ return func(
+ self,
+ *args,
+ request=_Request(method, path, args_dict, self,
+ resp_structure),
+ **kwargs)
+
+ return func_wrapper
+
+ return call_decorator
+
+ @staticmethod
+ def api_get(path, resp_structure=None):
+ return RestClient.api(
+ path, method='get', resp_structure=resp_structure)
+
+ @staticmethod
+ def api_post(path, resp_structure=None):
+ return RestClient.api(
+ path, method='post', resp_structure=resp_structure)
+
+ @staticmethod
+ def api_put(path, resp_structure=None):
+ return RestClient.api(
+ path, method='put', resp_structure=resp_structure)
+
+ @staticmethod
+ def api_delete(path, resp_structure=None):
+ return RestClient.api(
+ path, method='delete', resp_structure=resp_structure)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 18:39:12 +0000